NEW IN ORACLE CLUSTERWARE 19C

Oracle Clusterware 19c enhances the new deployment options for easier management and deployments of large pool of clusters. The new architecture called Oracle Cluster Domain would enable individual clusters to dedicate their resources to the database or application as management tasks such as deployment, storage management, performance monitoring is delegated to run on a pre-defined Cluster called the Domain Services Cluster.

As shown in figure 2 above, a Cluster Domain consists of a single Domain Services Cluster (DSC) and one or more Member Clusters. DSC provides many services which can be utilized by Member Clusters. There are four types of member clusters

1. Database Member Cluster with high performance local storage that is not shared with other Member Clusters.
2. Application member cluster typically hosting applications.
3. Database Member Cluster accessing ASM storage using the ASM I/O services provided by the Domain Services Cluster (DSC). This is also referred to as indirect access.
4. Database Member Cluster accessing ASM storage on the Domain Services Cluster directly via SAN storage. This is also referred to as direct access. Regardless of the member cluster type, all of them benefit from the centralized Management Repository services, Trace File Analyzer services and other services provided by the DSC.

CHOOSING A DEPLOYMENT MODEL.

The choice of deployment no longer depends on the installation type as in previous releases. Oracle Clusterware now allows new installations to be deployed as a Cluster Domain model while allowing standalone Clusters to be converted to Member Clusters. It is important to note that Oracle Clusterware licensing remains the same for both deployment models. Some aspects to consider when choosing a deployment model are:

• Cluster Domain architecture delegates the management aspects of Member Clusters to the DSC. This optimizes the Member Cluster management in terms of both provisioning and performance management.
  Resources such as CPU and memory on the Member Cluster can now be dedicated to the database computing needs resulting in cost savings for the customer.
• Cluster Domain architecture provides a unified consolidated storage solution via the DSC. This model makes it easier to provision new databases using the Oracle ASM cloning feature. Storage consolidation using the Cluster Domain deployment model benefits vastly from the new Database oriented storage management features introduced in Oracle ASM.
• Centralized data collection facilities provided by Autonomous Health Framework (AHF) in the DSC allow the Member Clusters behavior to be analyzed using Machine learning capabilities used by AHF which continuously monitors the Member Clusters. This functionality can in many cases prevent a problem before it occurs. For example, AHF can detect anomalies between real time performance counters and expected values to notify system admin of impending performance issues while generating targeted diagnosis and corrective actions.